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They can get that hot if being left on solidly for 4 days (all being cycling on and off every few mins).
Typically with these issues it points to lock out, what would be useful is to see how many amps the pumps are pulling when running, as it could be the PCB is going into a fault state if its detecting the pumps pulling to much current, however as no error is shown on the display, most likely its a faulty PCB.
No problem, I would suggest you opt for a swimming pool or spa engineer, electricians in my mind dont really understand complexities of heating circuits.
Is there anything else I can assist you with?